| 1920 Waterford Senior Hurling Championship | |
| Champions: | Dungarvan |
| Count: | 3 |
| Runners-Up: | Ferrybank |
| Previous Year: | 1919 |
| Previous Tournament: | 1919 Waterford Senior Hurling Championship |
| Next Year: | 1922 |
| Next Tournament: | 1922 Waterford Senior Hurling Championship |
The 1920 Waterford Senior Hurling Championship was the 21st staging of the Waterford Senior Hurling Championship since its establishment by the Waterford County Board in 1897.
Ferrybank were the defending champions.
Dungarvan won the championship after a 9–02 to 1–00 in the final.[1] This was their third championship title overall and their first title since 1917.